Replace HuggingFace model with Groq free API to fix payment required error

agent.py

@@ -24,8 +24,8 @@ from langgraph.graph import StateGraph, END
 from langgraph.graph.message import add_messages
 from typing_extensions import TypedDict
 
-# HuggingFace imports
-from huggingface_hub import InferenceClient
+# Groq imports for free AI model
+from groq import Groq
 
 # Utils system imports
 from utils import (
@@ -68,20 +68,20 @@ class AgentState(TypedDict):
 # =============================================================================
 
 class LangChainQwen3Brain:
-    """AI Brain using LangChain + Qwen3-8B"""
+    """AI Brain using LangChain + Groq free models"""
     
     def __init__(self):
-        self.client = InferenceClient(
-            provider="auto", 
-            api_key=os.environ.get("HF_TOKEN", "")
+        # Use Groq instead of HuggingFace
+        self.client = Groq(
+            api_key=os.environ.get("GROQ_API_KEY", "")
         )
-        self.model_name = "Qwen/Qwen2.5-7B-Instruct"
+        self.model_name = "llama3-8b-8192"  # Free Groq model
         
         # Setup parsers
         self.json_parser = JsonOutputParser()
         self.str_parser = StrOutputParser()
         
-        print("🧠 LangChain Qwen3 Brain initialized")
+        print("🧠 LangChain Groq Brain initialized")
     
     def _invoke_model(self, messages: List[Dict[str, str]]) -> str:
         """Invoke model with messages"""
@@ -386,7 +386,7 @@ class LangGraphUtilsAgent:
         self.ai_brain = ai_brain
         
         print("🤖 LangGraph Utils Agent initialized!")
-        print("🧠 AI Brain: Qwen3-8B with LangChain")
+        print("🧠 AI Brain: Groq free models with LangChain")
         print("🔧 Tools: YouTube, Image OCR, Audio Transcript, Wikipedia, File Reader, Text Processor")
         print("⚡ Features: AI-driven routing, Smart tool selection, Multimodal processing")